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AJNR - American Journal of Neuroradiology

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American Journal of Neuroradiology 25:1189-1193, August 2004
© 2004 American Society of Neuroradiology

Case Report
BRAIN

Segmental Agenesis of the Internal Carotid Artery Distal to the Posterior Communicating Artery Leading to the Definition of a New Embryologic Segment

Philippe Gailloud^a, Richard E. Clatterbuck^b, Jean H.D. Fasel^c, Rafael J. Tamargo^b and Kieran J. Murphy^a

^a Division of Interventional Neuroradiology, Johns Hopkins Medical Institutions, Baltimore, MD
^b Department of Neurological Surgery, Johns Hopkins Medical Institutions, Baltimore, MD
^c Department of Morphology, University of Geneva, Geneva, Switzerland

Address correspondence to Philippe Gailloud, MD, Division of Interventional Neuroradiology, Department of Radiology and Radiological Sciences, Johns Hopkins Medical Institutions, Baltimore, MD 21287

Summary: We report a case of segmental agenesis of the right internal carotid artery (ICA) in a 53-year-old woman, associated with a saccular aneurysm of the left anterior cerebral artery (A1 segment) presenting with a right hemispheric transient ischemic attack. The agenetic segment was located distal to the origin of the posterior communicating artery (PComA), as documented both angiographically and by direct surgical inspection. This observation suggests the existence of a previously unrecognized embryologic segment of the ICA, located between the PComA origin and the terminal bifurcation of the ICA into the anterior and middle cerebral arteries.

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				I.M. Burger, F. Siclari, L. Gregg, and P. Gailloud Bilateral Segmental Agenesis of the Vertebrobasilar Junction: Developmental and Angiographic Anatomy AJNR Am. J. Neuroradiol., November 1, 2007; 28(10): 2017 - 2022. [Abstract] [Full Text] [PDF]

				T. Krings, P. L. Lasjaunias, P. Gailloud, and K. J Murphy Segmental agenesis of the internal carotid artery distal to the posterior communicating artery leading to the definition of a new embryologic segment. AJNR Am. J. Neuroradiol., February 1, 2006; 27(2): 246 - 247. [Full Text] [PDF]